Exchange 2013 on DDNS ?

Hi

I have setup an exchange box on my domain with the following
1-I am sending my emails using SMTP.com (we don't rely on our ISP).
2-Receiving emails - Internally I have no issues. but external emails are set up one-on-one with GoDaddy.
The domain name is hosted @GoDaddy. so I created a bunch of emails accounts (user1@mycompany.com,user2@mycompany.com et...)
and using a POP connector I am getting those emails in my exchange box who is then distributing them...

Now I have a problem. the problem is that my boss comes and tells me that he wants to create 400 emails addresses and he doesn't want to pay 14.4 USD * 400 /year for this.

Is there a way I could DDNS to solve the issue of me being tied up with my ISP ?
The whole setup is built upon me being able to change ISP in a snap.
(using Godaddy for incoming and retrieving them using POP connector - and sending using SMTP.com).

You ideas/suggestions are welcome as I have no idea how to setup Exchange with DDNS.

Thanks
Pierre AmmounAsked:
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IvanSystem EngineerCommented:
Hi,

why don't you just route email directly to you Exchange?
Create accepted domain in Exchange, create users and email addresses, and point MX from GoDaddy to your public ip..

That way you can have as many email addresses and accounts as you like.
If you change ISP, you will just log to GoDaddy DNS and change MX record (and autodiscover).
You can still send them via smtp.com if you like it..

Regards,
Ivan.
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